| Maximo Construction | Carrillo Maynor | arcadia@maximoconstruction.com | (415) 377 6728 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Maxx Tile | Michael Maxwell Gant | max@maxxtile.com | (415) 506 4801 | Other | Novato · Marin County | — | — |
| Maya Heating & Cooling | Maya Heating & Cooling | — | (415) 845 9503 | HVAC | San Rafael · Marin County | — | — |
| Mayan Climber Tree Service INC | Pech Tah Petronilo | — | (415) 948 7296 | Tree | Novato · Marin County | — | — |
| Mayer & Company | Kenneth James Mayer | — | (415) 453 0434 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Maza Bro's Construction Corp | Wuilmer Ivan Mazariegos Monterroso | mazabrosconstruction@outlook.com | (415) 879 0631 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mazaro Painting | Mazaro Painting | — | (415) 933 5519 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Mc Ardell Landscape INC | Richard James Mc Ardell | — | (707) 773 3333 | Windows, patio, painters | Ross · Marin County | — | — |
| Mc Carthy Painting INC | Gregory Thomas Owens | greg@mccarthypainting.com | (415) 383 2640 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mc Donald Builders | Mc Donald Builders | — | (415) 381 2897 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mc Gowan Construction | Mc Gowan Peter | — | (415) 850 0183 | Other | Mill Valley · Marin County | — | — |
| Mc Guinness Construction INC | Max Cronon Mc Guinness | — | (415) 269 6084 | GC, remodel, ADU | Bolinas · Marin County | — | — |
| Mc Kenzie Landscaping | Mc Kenzie Landscaping | — | (415) 613 2784 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Mccarthy Design/build | Mccarthy Design/build | patrick@mccarthydesignbuild.com | (415) 509 5423 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Mccauley Construction INC | Scott Charles Mc Cauley | — | (415) 505 3018 | GC, remodel, ADU | Novato · Marin County | — | — |
| Mccowan Berrones & Company LLC | Ryan Bramwell Mccowan | — | (925) 788 2579 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mcguire & Sons | Mcguire & Sons | — | (415) 454 2719 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Mckeon Finish Carpentry INC | Mark Thomas Mc Keon | mark@mckeonfinishcarpentry.com | (415) 306 3340 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mcl General Contractor INC | Erick Macleyn Lopez Juarez | — | (415) 726 8169 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mclaughlin Construction | William James Mclaughlin | — | (415) 910 6914 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Mcleran Roofing & Gutters | Sara Ann Lopez | — | (415) 456 7663 | Other roofers | San Rafael · Marin County | — | — |
| Mcoejv | Construction INC Maloney | — | (415) 895 5304 | Other | Novato · Marin County | — | — |
| Meadows Green Building And Design INC | Scott Allen Meadows | — | (415) 526 3480 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Meckfessel Construction | Robet Louis Meckfessel | — | (415) 309 1905 | GC, remodel, ADU | Point Reyes Station · Marin County | — | — |
| Meenaghan Construction | James John Meenaghan | — | (415) 785 7789 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Meezan Construction | Patrick Scott Meezan | — | (415) 847 6023 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Mehrdad Peter Ghodsian | Mehrdad Peter Ghodsian | — | (415) 407 7383 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Mekisich Horticultural Services | Anthony Martin Mekisich | — | (415) 388 3960 | Windows, patio, painters | Greenbrae · Marin County | — | — |
| Mellor Construction | Derek Scott Mellor | — | (707) 685 1767 | GC, remodel, ADU | Novato · Marin County | — | — |
| Mendez Tree Service | Ivan Arturo Mendez Rodas | — | (415) 261 5044 | Tree | Greenbrae · Marin County | — | — |
| Mendieta Landscaping | Mendieta Landscaping | — | (415) 748 7404 | Windows, patio, painters | Novato · Marin County | — | — |
| Meridian Commercial Property Management | Meridian Commercial Property Management | — | (415) 521-5490 | Property managers | Novato · Marin County | — | — |
| Meridian Line Construction | Kurtis Paul Major | — | (310) 918 6925 | GC, remodel, ADU | Forest Knolls · Marin County | — | — |
| Merlin's Touch | Merlin's Touch | — | (415) 250 7964 | Windows, patio, painters | Sausalito · Marin County | — | — |
| Merz Bros Construction INC | John Karl Merz | — | (415) 895 5416 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Mesa Chica Landscaping LLC | Ida Theoline Severson | — | (415) 629 2979 | Windows, patio, painters | Inverness · Marin County | — | — |
| Mesa Landscape | Mesa Landscape | — | (415) 271 3990 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Messiah Electric INC | Majano Abel Alvarez | — | (415) 571 1112 | Electricians | Novato · Marin County | — | — |
| Metro Construction INC | Bradford Charles Tardy | — | (415) 331 1101 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Metropolitan Glass Corporation | Mansoor Safapay | — | (415) 257 8900 | Windows, patio, painters | San Rafael · Marin County | — | — |